  
 <!DOCTYPE HTML>
<html lang="en-US">
<head>
<meta charset="UTF-8">
<title>利用 clipboardData 在网页中实现截屏粘贴的功能</title>
<style type="text/css">
#box{ width:200px; height:200px; border:1px solid #ddd; }
</style>
</head>
<body>

<h1>利用 clipboardData 在网页中实现截屏粘贴的功能</h1>   
<hr />
<div><input type="text" id="testInput" placeholder="截屏后粘贴到输入框中" size="30" /></div> 
 <script type="text/javascript">
(function(){
    var imgReader = function( item ){
        var blob = item.getAsFile(),
            reader = new FileReader();

        reader.onload = function( e ){
            var img = new Image();

            img.src = e.target.result;
            document.body.appendChild( img );
        };

        reader.readAsDataURL( blob );
    }; 
     document.getElementById( 'testInput' ).addEventListener( 'paste', function( e ){
    var clipboardData = e.clipboardData,
        i = 0,
        items, item, types;

    if( clipboardData ){
        items = clipboardData.items;

        if( !items ){
            return;
        }

        item = items[0];
        types = clipboardData.types || [];

        for( ; i < types.length; i++ ){
            if( types[i] === 'Files' ){
                item = items[i];
                break;
            }
        }

        if( item && item.kind === 'file' && item.type.match(/^image\//i) ){
            imgReader( item );
        }
    }
    });
})();  
</script>

</body>
</html>
 